Arc lamp for irradiating purposes



lwarfi'i m, H.164. M. VOLMER 2,074,500

ARC LAMP FOR IRRADIATING PURPOSES Filed May 15, 1935 2 Sheets-Sheet 1 March 23, 1937. M. VOLMER 2,074,600

ARC LAMP FOR IRRADIATING PURPOSES Filed May 15, 1955 2 Sheets-Sheet 2 Patented Mar. 23, 1937 ARC LAMP FOR IRRADIAT'ING PURPOSES Max Volmer, Neubabels berg-Steinstucken, Germany Application May 15, 1935, sci-mm. 21,602

In Germany May 26, 1934 6 Claims.

Arc-lamps for irradiating purposes have up to now not met with general approval because their practical employment, especially in the hands of laymen, is difficult and their manipulation is not dangerless. Toobviate this, the construction should be such that the current-carrying parts cannot be touched after the circuit has been positively interrupted. The present improved lamp is designed in this way, and in order to attain 10 the object in view the electrode holders arearranged in the interior of a casing, designed preierably as a reflector, which is closed by a protective grating. In the thus improved iamp the electrode holders and the protective grating are rigidly connected with one another so as to constitute one structure which can be removed from the casing or the reflector only simultaneously by interrupting the further supply of current. The electrode holders and the protective grating are, of course, insulated from one another. When said structure has been removed from the casing or reflector, or moved into inoperative position respectively, the electrodes can be easily exchanged, if necessary, and the casing or reiiector can be conveniently cleaned.

The invention is illustrated diagrammatically and by way of example on the accompanying drawings, on which Figure 1 is a vertical axial section through an arc-lamp for irradiating pur- 0 poses designed according to this invention, Figure 2 is a front view of the same, and Figure 3 is likewise a vertical axial section showing, however, a modification, the structure comprising the electrodes, their holder and the protective grating being, in ,this case, turned upwardly into inoperative position.

Fig. 4 is a section in the line 4-4 of Fig. 3, some details being modified.

On the drawings, f (Figs. 1 and 2) denotes the I electrodes, is and k are electrode-holding rods,

and a is a non-metallic common carrier for them, g is one of the current-carrying members conducting the current to the outer one of said electrodes.

The inner end of the member a is conductively' connected with a socket orfltting c of any desired type, for instance the plug type or the bayonet type or the screw type or the like. Attached to the fitting. or socket c is also a reflector e which is closed at its front by a protective grating b, aifixed to the outer end of the electrode-rod holder 11. v

In order to get access to the electrodes and to the interior oi-the reflector, it is necessary to withdraw or unscrew the holder 0 with the re flector e from the fitting or socket e, but in doing that the electrode holder, together with the electrodes, is also disconnected from the current supply so that the electrodes can be touched without any danger, and the same is true of the interior of the reflector. 5

In order to form the are, it is, of course, necessary to bring the ends of the electrodes in contact with one another. of the two electrode holders k and R the latter is axially shiftable in a bore of an extension a of the non-metallic carrier a of the electrode holders. Said bore is enlarged at its outer end and contains in this enlargement a slidabie member 11. which is firmly connected with the electrode holder k Said member n is sub ject to the action of a helical compression spring 0 located in said enlargement of said bore and tends continually to keep the electrodes remote from one another.

Within'the slidable member 12 is a pawl p, the toothshaped end of which can engage a recess a. provided in the enlargement of the bore of the extension a A small helical compression spring q can hold said tooth of the pawl in engagement with said recess when the extension a has been pressed inwardly, counter to the pressure of the 2 spring 0. When these parts are in this position the electrodes are in contact with one another and the current passes through them both. The pawl can be released by a pin 1' provided in the extreme end of the member 12.

In the modification shown in Figs. 3 and 4 the holder a of the electrodes 1 is hinged at h to an arm 5 firmly connected with the body of the lamp and the reflector e. Within the holderv a is a plug 0 fitting into the socket d when the holder is turned from the inoperative position shown in Fig. 3 into its operative position in which the electrodes are located inside the reflector and behind the protective grating b which is afflxed to the free end 01' the holder 11. and is then located in iront of the reflector e. This latter has in its upper portion a slot for the passage of the electrodes 1' and oi the current-supplying rods 1:. One 01' said rods is conductively connected with the plug 0 and the other is conductively connected with a plug m to which likewise a socket (not shown) appertains. It is also with this constructional form' obvious that whenthe protective grating is lifted from its operative position (not shown in Fig. 3) into its inoperative position, or position of rest respectively, and that when simul-' taneously therewith the electrodes are lifted, at the same time the plug c will be withdrawn from the socket :1 so that the circuit supplying the electrodes with current will be interrupted.

Owing to the provision of the slot in the upper portion of the reflector it is possible to provide the apparatus with a chimney for the escape of the hot air or gases present in the reflector and tending to render the reflecting surface thereof In this constructional i'orm the arrangement for bringing the'electrodes in contact with one another in order to form the arc diifers somewhat from the arrangement shown in Fig. 1. The electrode holder 1: is designed as a bell-crank lever which is supp rted at It in the body member a of the lamp. The shorter arm of said lever is subject to the pressure of a small helical compression spring 0 'which is a true equivalent to the spring q oi Pig. 1 in that it continually tends to keep the electrodes remote from one another. Opposite said p ng is a pin m by means of which the electrode holding lever It can be so turned that the electrodes contact with one another I whereby the arc will be formed.

I claim: 1. An arc-lamp tor irradiating purposes. comprising a reflector, electrodes, therein. an electrade-holder connected with said reflector at the centre-portion thereof, and a protective grating attached to the electrode-holder at the front of the reflector, and covering practically the entire opening of the same.

2. An arc-lamp for irradiating 9 9 9 'comprising, in combination, a concave reflector, a protective grating arranged at the front of the reflector and covering practically the-entire open- '35 mg of the same, an electrode holder attached to said reflector and having in turnsaid protective grating attached to it; an electrode flrmly attached to said holder. and another electrode movably attached to said holder so as to render possible bringing the electrodes in contact -with one another.

3. An arc-lamp as specified-in claim 2, comprising further, incoinbination with the movable electrode, means for moving it, these means being attached to the electrode holder. I

4. An arc-lamp for irradiating P rposes, comprising, in combination, a concave reflector, a protective grating arranged at the front of the reflector and covering practically the entire opening of the same; an electrode holder attached to said reflector and having in turn said grating attached to it and being removable from the reflector together with the said grating; an electrode firmly attached to said holder, and another electrode movably attached to said holder so as to render possible bringing the electrodes in contact with one another.

5. An arc-lamp for irradiating purposes, comprising, in combination, a concave reflector having an aperture in its top, a protective grating attached to the reflector at its front; an electrode holder attached to said reflector and having in turn said grating attached to it; and two electrodes attached to said holder and extending from the same into the said reflector through the aperture of the same.

6. An arc-lamp for irradiating purposes, comprising, in combination, a concave reflector having an aperture in its.top; a protective grating arranged at the front of the reflector; an electrode holder hinged to the rear portion of said reflector and having in turn said grating attached to it and being removable from the reflector together with the said grating; and two electrodes attached to said holder and extending from the same into the said reflector through the top aperture of the same. v

' MAX VOLBER. 

